An electrohydraulic fluid system monitors the fluid line 1, reservoir 2, motor pumps 4 and 6, accumulators 10 and drain line 13 in an electrohydraulic fluid system. The electrohydraulic fluid monitor system includes sensors 14-40 to detect temperature, pressure, fluid level and motor pump current in the electrohydraulic fluid system. Signals from these sensors are converted 54 by an analog to digital converter into digital signals read by a processor unit 58 and stored by the processor unit as d...

A method of detecting a fuel leak from a fuel store of an aircraft where a processor receives inputs relating to the amount of fuel in the fuel store and to the rate of fuel used by the aircraft. The processor defines a fuel flow system state defined by a noise-compensated measures of the amount of fuel in the fuel store, a fuel leak amount estimate and a fuel leak rate estimate. The processor periodically calculates a new estimated state of the system in view of a previous estimated state and v...

Leaks in a processing chamber, including "virtual leaks" resulting from outgassing of material present within the chamber, may be detected utilizing an optical emission spectroscopy (OES) sensor configured to monitor light emitted from plasma of a sample from the chamber. According to certain embodiments, gas introduced into the chamber by the leak may be detected directly on the basis of its optical spectrum. Alternatively, gas introduced by the leak may be detected indirectly, based upon an op...

A method for detecting loss of SF6 gas from electrical utility apparatus determines a molar ratio of gas in a container at an initial time and of gas in the container at a subsequent time. Measurement of temperature is determined by averaging ambient temperature and temperature of the surface of the container. The initial values of pressure and temperature define the initial value of n as follows: n.sub.o=P.sub.gas o/T.sub.gas o The value at a subsequent time is n.sub.n=P.sub.gas n/T.sub.gas n T...

A mobile leakage detecting device according to the present invention is provided for simplifying detecting operations of a leak portion and enhancing operational efficiency, and is characterized by microphones for detecting ultrasonic waves generated at a fluid leak portion, an input device for inputting positional information of the leak portion in a searching area detected based on output signals from the microphones, a photograph device for photographing the leak portion, a display device for...

A leak detecting system for a transpiration purge system including a fuel tank 1 and a canister 13 includes a jet pump 8, which leads the atmosphere into the fuel tank 1 using a return flow of excess fuel of fuel pumped to an internal combustion engine, internal pressure measuring means 15, and fuel volume detecting means 18. After intaking air via pressurizing means for a predetermined time, the leak detecting system judges that a leak is present when a holding pressure measurement value in a s...

Disclosed is a method for measuring leakage flow rate of a valve wherein fluid flows through the valve in a single-phase flow of a gas or steam. The underlying principle upon which the leakage flow rate may be determined is that the heat loss across a length of bare pipe located downstream of the valve causes a decrease in the temperature of the leakage flow. Also disclosed is a method for measuring the leakage flow rate when the fluid passing through the valve transitions from a liquid-phase fl...

In order, in a diagnostic unit for leak testing of a tank system of an internal combustion engine, to allow minimization of the energy consumption during a diagnostics test and simultaneously prevent the emission of fuel gases, a sleep/wake-up mechanism is provided. The diagnostic unit enters a sleep mode for a selected time interval after the internal combustion engine is turned off, the diagnostic unit enters a wake-up mode at the end of the first time interval and at least acquires the measur...

A method for determining the presence of a leak in a water heater unit comprising a storage tank is presented. The present invention involves mounting one heating sensor on the lower half of the tank and another heating sensor on the upper half of the tank. Readings from both sensors are taken and compared to determine if the water heater tank has reached a steady state; if so, the cooling rate of the tank is determined. This cooling rate is compared to the historical natural cooling rate of the...

Systems and methods for monitoring pressurization performance of a cable network that may include detecting alarm conditions within the cable network, recording the time and date during which each alarm condition was initially detected, and calculating a length of time for each detected alarm condition during which the detected alarm condition remains unremediated.